loading specific .emacs file on command line?

[john doe]

Hopefully, someone can answer a couple of questions I
have--thanks in advance for anyone who responds.

Looking at the emacs man page I see there is a line
switch that allows you to use someone elses dotfile
when loading emacs:

emacs -u jdoe

Is there a line switch to load a specific .emacs
file... if you have more than one for the same user?
My problem is I have large sections of my .emacs file
that I want to use sometimes and not other times. Can
I have large sections of the .emacs file load only for
some files and not others?

Thanks.

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